Scale Models of Solar System and Galaxies

If the Earth is the size of a beach ball, how big is the Moon? If the solar system is the size of a fried egg, how big is our galaxy? In this interactive activity, you will be using everyday objects to represent the planets, the Moon, the Sun and the galaxies.

Compare Planets for Scale Models

This Planet Size Comparison lets you compare any planet (or the Sun or Moon) against any other, and view them at the same scale.